An abdominal hernia is a bulge that forms when an organ or piece of tissue pushes through a weak spot in the muscles of your abdominal wall. The most common version, an inguinal hernia in the groin, is so widespread that hernia repair surgery is performed on over 20 million people worldwide each year. Hernias can develop at birth, after surgery, or gradually over time as the muscle wall weakens.
How a Hernia Forms
Your abdominal wall is a layered sheet of muscle and connective tissue that holds your organs in place. When a gap or weak point develops in that wall, internal tissue (usually a loop of intestine or fatty tissue) can squeeze through the opening. The result is a soft bulge under the skin that you can often see or feel, especially when you cough, strain, or stand up.
The weakness in the wall can be something you’re born with, like a natural opening near the belly button that never fully closed. It can also develop after abdominal surgery, when the incision site heals with scar tissue that’s weaker than the original muscle. Or it can form slowly over years of increased pressure inside the abdomen from factors like obesity, pregnancy, chronic coughing, or regular straining during bowel movements. Older age and smoking also raise the risk.
Types of Abdominal Hernias
Hernias are classified by where they appear on the body:
- Inguinal hernia: Part of the bowel pushes into the inguinal canal, a passageway that runs along your inner thigh near the groin. This is the most common type, particularly in men.
- Umbilical hernia: A section of intestine pokes through the abdominal wall near the belly button. These are common in newborns and often close on their own, but they also occur in adults.
- Incisional hernia: Tissue pushes through the site of a previous surgical incision that has weakened over time. This can happen months or years after the original operation.
- Epigastric hernia: A type of ventral hernia that forms in the upper abdomen, above the belly button.
- Hiatal hernia: The opening in your diaphragm where the esophagus passes through widens, and the top of the stomach pushes upward into the chest cavity. This type doesn’t produce a visible bulge and causes different symptoms, primarily heartburn and acid reflux.
What a Hernia Feels Like
The hallmark symptom is a noticeable bulge or lump, typically in the groin, near the belly button, or along a surgical scar. The bulge often appears when you stand, cough, or lift something heavy, and it may flatten out when you lie down. You might feel a dull ache or pressure at the site, and the discomfort tends to worsen throughout the day or during physical activity.
Some hernias cause no pain at all and are only discovered during a routine physical exam. Others produce a burning or dragging sensation in the area. Hiatal hernias are the exception: because the bulge is internal, the symptoms are digestive, including heartburn, chest discomfort, and difficulty swallowing.
How Hernias Are Diagnosed
A doctor can often identify a hernia during a physical exam by feeling for the bulge and asking you to cough or bear down, which makes the hernia more prominent. When the hernia is small, hidden, or in an unusual location, imaging fills in the gaps.
Ultrasound is a strong first-line tool, particularly for groin hernias. Using a high-frequency probe while the patient strains or coughs, ultrasound can detect groin hernias with sensitivity above 97%. For hernias along the abdominal wall, including incisional hernias, ultrasound reaches about 98% sensitivity. CT scans are typically used for deeper or more complex hernias, such as those involving the diaphragm or the pelvic floor. MRI is sometimes preferred for groin hernias that are difficult to detect on physical exam, correctly identifying them in roughly 91% of cases.
When a Hernia Becomes Dangerous
Most hernias are not emergencies, but two complications change that. An incarcerated hernia means the protruding tissue has become trapped in the abdominal wall and can’t be pushed back in. Blood still flows to the tissue at this stage, but the situation can worsen. A strangulated hernia occurs when pressure from the surrounding muscle cuts off blood supply to the trapped tissue entirely. This is a life-threatening emergency.
Warning signs of strangulation include severe, escalating pain in the abdomen or groin that doesn’t let up, nausea and vomiting, and color changes in the skin around the bulge. The skin may first look paler than usual, then become reddish or darker. If you notice these symptoms together, you need emergency medical attention. Strangulated hernias require surgery to restore blood flow and remove any damaged tissue.
Surgical Repair and Mesh
Surgery is the only way to fix a hernia. Small, painless hernias can sometimes be monitored over time (a strategy called watchful waiting), but hernias don’t heal on their own and tend to grow larger.
The two main surgical approaches are open repair, where the surgeon makes a single incision over the hernia, and laparoscopic repair, where several small incisions allow a camera and instruments to do the work. Both methods involve pushing the protruding tissue back into place and reinforcing the weak spot. Most repairs use a synthetic mesh patch to cover the defect, though some are done with sutures alone.
A recent study of nearly 1,600 inguinal hernia repairs found that the one-year reintervention rate was 2.34% for patients who received mesh compared with 3.38% for those repaired without it. While mesh was associated with a modest reduction in the need for a second procedure, the difference was not statistically significant, suggesting both approaches can produce durable results in the right circumstances. Your surgeon will recommend the method best suited to the size and location of your hernia, your anatomy, and whether you’ve had previous repairs.
Recovery After Surgery
Most people feel noticeably better within a few days and significantly improved by one week. If your job is sedentary or involves light activity, you can typically return to work within one to two weeks. Jobs requiring heavy lifting or strenuous physical effort usually require four to six weeks off.
During recovery, you’ll need to avoid activities that strain your abdomen: jogging, weight lifting, cycling, and aerobic exercise until cleared by your surgeon. That also means skipping everyday tasks that involve heavy loads, like carrying large bags of groceries, picking up a child, lugging bags of pet food, or vacuuming. These restrictions protect the repair site while the tissue heals and help prevent recurrence.